Jubilees 4:7

And Adam and his wife mourned for Abel four weeks of years, [99-127 A.M] and in the fourth year of the fifth week [130 A.M.] they became joyful, and Adam knew his wife again, and she bare him a son, and he called his name Seth; for he said 'GOD has raised up a second seed unto us on the earth instead of Abel; for Cain slew him.'